I paint on my MacBook LCD, but I paint in 16bit and I dont use all white or all black because I know my image will go back to my CRT for final color correction.

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Aren't we using digital cameras these days?!?

Yes we are in some films, but many still use film. But even if we were stricktly using digital cameras we still use 4:4:4 HD cameras like the Genesis that basically create 12bit color pallette that still is beyond the gamut of CRTs and further beyond LCDs.